Comparative genomics of Blattabacterium cuenoti: the frozen legacy of an ancient endosymbiont genome.

摘要: Many insect species have established long-term symbiotic relationships with intracellular bacteria. Symbiosis bacteria has provided insects novel ecological capabilities, which allowed them colonize previously unexplored niches. Despite its importance to the understanding of emergence biological complexity, evolution remains hitherto a mystery in evolutionary biology. In this study, we contribute investigation leaps enabled by mutualistic symbioses sequencing genome Blattabacterium cuenoti, primary endosymbiont omnivorous cockroach Blatta orientalis, and one most ancient associations. We perform comparative analyses between cuenoti that sequenced endosymbionts, namely those from hosts Blattella germanica (Blattelidae) Periplaneta americana (Blattidae), endosymbionts harbored two wood-feeding hosts, subsocial Cryptocercus punctulatus (Cryptocercidae) termite Mastotermes darwiniensis (Termitidae). Our study shows remarkable stasis system throughout history cockroaches deepest branching M. darwiniensis, terms not only chromosome architecture but also gene content, as revealed striking conservation core genome. Importantly, central metabolic network inferred genomes was very early could be an outcome essential role played host’s nitrogen economy.